$ git clone -n https://src.fedoraproject.org/rpms/perl-Cache-Memcached.git /var/lib/mock/f45-build-22107-589/root/chroot_tmpdir/scmroot/perl-Cache-Memcached
Cloning into '/var/lib/mock/f45-build-22107-589/root/chroot_tmpdir/scmroot/perl-Cache-Memcached'...
$ git fetch origin 6abf8d5c56c61bfc52268bbf2eb0d2391a122846:KOJI_FETCH_HEAD
From https://src.fedoraproject.org/rpms/perl-Cache-Memcached
 * [new ref]         6abf8d5c56c61bfc52268bbf2eb0d2391a122846 -> KOJI_FETCH_HEAD
$ git reset --hard KOJI_FETCH_HEAD
HEAD is now at 6abf8d5 Rebuilt for https://fedoraproject.org/wiki/Fedora_45_Mass_Rebuild